构造柱圈梁抗震体系砌体平房振动台试验研究

Shaking table test of single-story masonry structures with aseismic system of constructional columns and ring beams

为研究在西藏当雄高烈度区农牧民安居工程中,拟建的采用圈梁构造柱抗震体系的单层混凝土砌块房屋的抗震性能,并探讨内横墙和打包带加固等对房屋抗震能力的影响,进行了2个相似比例为1/3模型的振动台对比试验,模型分别是无内横墙单层砌体结构模型和有内横墙且墙体用打包带进行加固的单层砌体结构模型。试验测试了结构模型的动力特性及其在不同地震作用下的加动力响应。试验结果表明：采用构造柱圈梁抗震体系的房屋,可达到村镇建筑9度抗震设防目标,基本符合建筑抗震三水准设防的要求;如若房屋再增加内横墙或墙体采用打包带网加固,抗震抗倒的能力更强。试验结果可为当雄高烈度区农牧民安居工程的房屋抗震加固、设计和施工提供参考依据。

This paper aims to research the aseismic performance of a single-story concrete block house that applies the aseismic system of constructional column and ring beam; this house is built in housing projects for farmers and herds- men in the highly seismic region of Dangxiong, Tibet. This paper also discusses the influence of cross wall and pack- ing belt reinforcement on the house. Shaking table tests of two one-third-scale models were conducted. Two models used a single-story masonry structure; one had no inner cross wall, and the other one had an inner cross wall and was reinforced with packing belts. The dynamic characteristics and aseismic response of models were evaluated under dif- ferent earthquake levels. Results indicate that the building with the aseismic system of constructional column and ring beam can reach the IX degree seismic fortification goal of rural buildings and accord with the three-level requirement for seismic fortification of buildings. Earthquake resistance ability can improve with the addition of an inner cross wall or through reinforcement with a packing belt net. The results can provide a referential basis for seismic strengthening, design, and construction of comfortable housing projects for farmers and herdsmen in Dangxiong.